Hi there
It sounds like you really miss your granddad, sometimes when someone dies it can take a long time to sink in that they have gone and it can be hard to accept that you are not going to see them again.
You say that your granddad was always there for you and it sounds like now he has died there is big gap in your life.
Some people find it helpful to remember those they have lost and you can do this in different ways, such as making a memory box and filling it with things that remind you of your granddad. Another way could be to write a letter to him telling him how you feel and how much you miss him, you could put this in your memory box or take it somewhere that was special to you and your granddad.
Some people find it helpful to talk about how they are feeling and it might be a good idea to think about who else is in your life that can be there to listen to you and support you.
Also ChildLine is always available if you want to talk, you can either phone free on 0800 1111, go online for a 1-2-1 chat or send a ChildLine email.
Take care
Sam